Beau's lines

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Beau's lines

[bōz′]
Etymology: Joseph H.S. Beau, French physician, 1806-1865
transverse depressions that appear as white lines across the fingernails as a sign of an acute severe illness such as malnutrition, systemic disease, thyroid dysfunction, trauma, or coronary occlusion.

Beau's lines

regular or irregular transverse lines, grooves, furrows or ridges across one or all visible nail plates, each representing temporary interruption of nail matrix activity; showing initially as a ridge at the proximal nail fold that is gradually carried distally with nail plate growth, ultimately to grow out, assuming no repeat cause; as nail plate grows at approximately 1 mm/week, the interval since the causative event can be calculated; Beau's lines affecting all nails (toes and fingers) indicate a systemic event (e.g. stroke; myocardial infarction); single-digit involvement implies a local cause (e.g. paronychia, local trauma)
References in periodicals archive ?
Beaus lines can also be caused by a life-threatening haemorrhage with hypotension.